linux-kernel - [PATCH 4/4] Sky Cpu and Nexus: check for create_proc

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Date:	Thu, 5 Jul 2007 20:55:37 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 4/4] Sky Cpu and Nexus: check for create_proc_entry ret code

This patch adds checking of create_proc_entry call
to prevent possible NULL pointer usage.

Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
---

 drivers/misc/hdpuftrs/hdpu_nexus.c |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/hdpuftrs/hdpu_nexus.c b/drivers/misc/hdpuftrs/hdpu_nexus.c
index 01bc917..cc81853 100644
--- a/drivers/misc/hdpuftrs/hdpu_nexus.c
+++ b/drivers/misc/hdpuftrs/hdpu_nexus.c
@@ -78,10 +78,20 @@ static int hdpu_nexus_probe(struct platform_device *pdev)
 	}
 
 	hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root);
-	hdpu_slot_id->read_proc = hdpu_slot_id_read;
+	if (!hdpu_slot_id) {
+		printk(KERN_WARNING "sky_nexus: "
+		       "Unable to create proc dir entry: sky_slot_id\n");
+	} else {
+		hdpu_slot_id->read_proc = hdpu_slot_id_read;
+	}
 
 	hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root);
-	hdpu_chassis_id->read_proc = hdpu_chassis_id_read;
+	if (!hdpu_chassis_id) {
+		printk(KERN_WARNING "sky_nexus: "
+		       "Unable to create proc dir entry: sky_chassis_id\n");
+	} else {
+		hdpu_chassis_id->read_proc = hdpu_chassis_id_read;
+	}
 
 	return 0;
 }
-
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